it is either

1. A CSS declaration in your WP theme stylesheet that is 'floating' all images left (look for a 'float: left;' declaration). Or…
2. You are using a plugin that put a hack in place to cope with a bug in  WP2.5 and is either old or in need of updating. The 'Contact 7' plugin does this as does an older version of the 'NextGen Gallery'

Thanks a lot. I will be using you're plugin in the next few weeks. It's working now. I'll send you some moohlah once it is up and running. Ill be back here. 🙂

I have this follow up question.

I actually removed the .post img {display:block} from my stylesheet.css and it aligned all the images now. Just to make sure all the files are ok. I re-installed the forum, but then the problem I have now is this..

http://www.fileden.com/files/2008/2/9/1749988/nursing%20crib%20forum2.JPG

I have tried changing the styles and icon set, but it's the same, please help.. cant wait to have the forum up and running

Options > Posts

Try looking through the options. A lot of thngs can  be changed there.

Thanks, Im now slowly getting it. ;-D